Revenues (Contract Liabilities) (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Change In Contract With Customer, Liability [Roll Forward] | ||
| Beginning of year | $ 191 | $ 95 |
| Revenue recognized included in the beginning balance | (18) | (15) |
| Increase due to consideration received, net of revenue recognized | 354 | 111 |
| End of year | 527 | 191 |
| Current portion - end of year | $ 7 | $ 5 |
| X | ||||||||||
- Definition Change In Contract With Customer, Liability [Roll Forward] No definition available.
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| X | ||||||||||
- Definition Contract With Customer, Liability, Increase From Cash Receipts No definition available.
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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